Now we're getting somewhere, guys :-)
I took the liberty to PM both batpig and jdsmothie (thx for the tip, BIslander) and asked if they could be so kind and give their input on the matter as well.
batpig immediately recognized the issue:
Yeah, to be honest I'm not 100% clear on the specifics of what/why it happens, but I can just tell you from experience that other 4520 owners have reported the exact same thing, so I knew exactly what it was when I read your post.
jdsmoothie also had an explanation to point us in the right direction:
This was a feature that could be set to ON/OFF on prior year models although the feature was dropped on the XX13 models and apparently set to OFF on the 3313CI and ON on the 4520CI.
This lead me to download various user manuals for the current, and a few of the previous Denon receivers. From what I found it might seem like Denon made a decision to remove/hide some of the Surround Back specific settings in the Surround Parameter section, on the XX13- and 4520-models and onwards. Some of the previous models, like the AVR-3311, AVR-3312, AVR-4311 etc. all have it's on section to adjust settings for how the Surround Back speakers should behave in various situations... On the newest/current models however this seems to have been replaced by a section called "Speaker Select", which only let us choose whether output to the surround back should be enabled or not, period...
You can see the difference in the menus on the pictures below:AVR-3312 (Surround Back - Settings)AVR-3313 (Speaker Select - Settings)AVR-4311 (Surround Back - Settings)AVR-4520 (Speaker Select - Settings)
If it is as jdsmoothie explains, and the default setting for the AVR-4520 is equal to the previous "ON"-setting from the AVR-3312 and/or the AVR-4311, there is nothing more to discuss
It just bugs me that they make decissions to trim the various options, and make wild assumptions on what "all" users might and might not want to be able to adjust.
Also, as mentioned previously, it's not that it doesn't sound good or anything like that, but it's rather inconvenient to have to go into all kind of sub-menus and change the speaker-setup to be able to listen to the native 5.1 track, if one would wish to do so
Nevertheless this lack of information in the user manual for the AVR-4520 (and the AVR-3313 for that matter) is something that Denon should really fix. It's very difficult to truly understand what's going on in the audio-processing bit, when they leave out bits and pieces... (Better to use batpigs manuals I think
But anyway, thank you all for your input on this issue.
I'm expecting to get a "reply" from my local store (as Denon Support couldn't care less to answer me directly
) tomorrow on their thoughts on the matter.
I will update this post, if something interresting comes up.
Thank you so much